Technician A says sometimes the exhaust lobe on the camshaft will wear quickly and more severely than the intake. Technician B says the roller cam cuts valvetrain friction by 75%. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct. The exhaust lobe on the camshaft tends to wear more quickly and severely than the intake. Technician B is incorrect, as a roller cam can cut valvetrain friction by up to 50%, not 75%.

Technician a Says Sometimes the Exhaust Lobe on the Camshaft